Physics Review

1) Write Newton’s 1st Law. Give an example.

An object in motion stays in motion…An object at rest remains at rest….Unless acted upon by an unbalanced force!

For example, when you slam on the breaks of a car, stuff flings forwardoff the seat (because it was in motion and remains so…)

2) Write Newton’s 2nd Law. Give an example.

F = ma

It is easier to push a VW beetle than a Chevrolet Suburban…

A bullet hurts more that is shot than thrown at you!

3) Write Newton’s 3rd Law. Give an example.

examples include:

a rocket shoots “stuff” down and goes up

Recoil: a bullet moves forward asthe gun pushes back into your shoulder

For every action there is an equal and opposite reaction

4) Explain how force, mass, and acceleration are related. Not just the formula.

If force is held the same…when mass is increased, acceleration

will decreased.

If mass is the same, it takes greaterforce to obtain greater acceleration

If acceleration held the same, a largermass requires a larger force

F = ma

5) Draw a graph for the following scenarios: A) A person running fastB) A person walking C) A person that is standing stillD) A person running that stops for a water break.

run

nin

g

walking standing still

6) Draw and label a picture of a balanced force.

20N 20N

7) Draw and label a picture of an unbalanced force.

20N 16N

20N 20N

or even….

8) Create and solve your own speed problem.

Josh drives his car at a speed of 45 miles per hour….what distancedoes he cover in three hours?

Ans: 135 miles

Claire drives her car 390 miles ata rate of 65 miles per hour. Howlong was she driving?

Ans: 6 hours

9) What is acceleration? What causes an object to accelerate?

acceleration is a change in velocity. It includes:• speeding up• slowing down• changing direction

acceleration is caused by unbalanced forces

10) Create and solve your own force problem. (Using F= M x A)

Jazmin pushes a box with a force of48N. If the mass of the box is 12Kg,what is the acceleration?

Ans: 4 m/s/s

Justin pushes another box with a forceof 72N. If the box accelerates at a rateof 9 m/s/s, what is the box’s mass?

Ans: 8KG

11) What is velocity?

Speed with direction

for example: 68 miles per hour north

or

28 m/s

12) What is potential energy?

Stored energy. Energy that has the ability to “do work.”

examples include •a rollercoaster at the top of a hill….

•a battery (chemical potential energy)

•the stress built up in a fault betweentwo of Earth’s plates.

13) What is kinetic energy?

Energy of motion…..

Examples include: •an apple falling,

•a rollercoaster at the bottomof the first big hill,

•a baseball flying through the air.

Physics Review1) Write Newton’s 1st Law. Give an example. 2) Write Newton’s 2nd Law. Give an example. 3) Write Newton’s 3rd Law. Give an example.

4) Explain how force, mass, and acceleration are related. Not just the formula. 5) Draw a graph for the following scenarios:

5A) A person running fast5B) A person walking

5C) A person that is standing still5D) A person running that stops for a water break.

6) Draw and label a picture of a balanced force.7) Draw and label a picture of an unbalanced force.

8) Create and solve your own speed problem. 9) What is acceleration? What causes an object to accelerate? 10) Create and solve your own force problem. (Using F= M x A)

11) What is velocity? 12) What is potential energy? 13) What is kinetic energy?